Brain and Behavior Depending on Timing of Iron Deficiency in Human Infants

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ClinicalTrials.gov Identifier: NCT00642863

Recruitment Status
:
Completed

First Posted
: March 25, 2008

Last Update Posted
: October 29, 2014

Sponsor:

Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)

Information provided by (Responsible Party):

Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)

It is common in many populations that babies develop iron deficiency or iron deficiency anemia (that is, too few healthy red blood cells due to lack of iron). This is due to rapid growth in infancy combined with limited sources of iron in the infant diet. The amount of iron the baby receives across the placenta during pregnancy is another important factor. This study focuses on infants who are born with less than the usual amount of iron in their bodies. The purposes of the study are to assess effects of lower iron at birth on infant behavior and development and to determine if providing iron supplements to such infants beginning at 6 weeks fosters healthier development. Another part of the study will determine the effects of iron deficiency anemia at different times during infant development.

The project focuses on brain-behavior effects depending on the timing of iron deficiency (ID) and iron repletion in human infants. Iron deficiency (ID) is the world's most common single nutrient disorder, differentially affecting pregnant women and infants everywhere. The study promises to be the first systematic investigation of brain and behavior effects of prenatal dietary iron deficiency in human infants. The design will support comparisons of brain/behavior effects depending on the timing and duration of ID. The study will assess reversibility of effects, depending on timing of ID and its treatment, and examine maternal vs. fetal iron regulatory mechanisms in placenta and white blood cells. State-of-the-art neurophysiologic and behavioral measures will test specific hypotheses regarding effects of ID on sensory, motor, cognitive, affective-social and regulatory functions related to impaired myelination of sensory/motor systems and altered structure, neurotransmitter function and neurometabolism in targeted brain regions (basal ganglia and hippocampus). The study will be conducted in China, a rapidly developing country where ID often occurs among pregnant women and infants in the absence of generalized undernutrition. Cord blood hemoglobin (Hb) and ferritin concentrations will be measured in 1300 rural full-term infants, with iron status determined again at 9 and 18 mo. Brain-behavior assessments in the perinatal period will involve 359 infants ("newborn cohort"): 59 with low Hb ("low birth iron" group) will receive iron; 200 with marginal Hb or low cord ferritin ("marginal birth iron" group) will be randomly assigned at 6 wk, 50 to iron therapy and 150 to vitamins only; and 100 with normal cord Hb and ferritin levels ("normal birth iron" group) will receive vitamins only. The remaining 763 infants with cord blood testing will form the "blood screen cohort." At 9 and 18 mo, the newborn cohort will be reassessed, along with IDA infants from the blood screen cohort - about 58 at 9 mo ("early postnatal IDA") and 48 at 18 mo ("late postnatal IDA"). Approximately 39 marginal-birth-iron vitamins only-treated infants in the newborn cohort may also have IDA at 9 mo ("combined ID"). IDA infants will be treated with vitamins with iron. Differential effects and/or reversibility depending on timing of ID or treatment could inform health policy and practice worldwide. However, the effects of prenatal iron deficiency have received very little study in human infants due in large part to previous thinking, no longer accepted, that the infant was protected. Up to 75% of pregnant women worldwide are anemic, with about half due to ID. An estimated 20-25% of 6- to 24-mo-old infants have IDA, and more have ID without anemia. Thus, the public health implications of study findings could be profound.

The project is expected to continue with a 5-year follow-up (Aug 2013-July 2017).

a single daily dose of 1-2 mg/kg of elemental iron (5 mg from 6 wk to 9 mo and 15 mg from 9 to 18 mo.) and 1500 IU vitamin A and 500 IU vitamin D from 6 wk to 18 mo.

Active Comparator: Marginal birth iron 2

Infants with marginal birth iron randomized to receive vitamins A and D without iron

Dietary Supplement: vitamins A and D

a single daily dose (liquid) of 1500 IU vitamin A and 500 IU vitamin D from 6 wk to 18 mo.

Active Comparator: Normal birth iron

Infants with normal birth iron who receive vitamins A and D without iron

Dietary Supplement: vitamins A and D

a single daily dose (liquid) of 1500 IU vitamin A and 500 IU vitamin D from 6 wk to 18 mo.

Experimental: Combined ID

Marginal-birth-iron vitamins only-treated infants who have IDA at 9 mo.

Dietary Supplement: Ferrous sulfate (liquid)

Infants who become iron deficient/anemic at 9 or 18 mo will take a single daily dose of 3 mg/kg of elemental iron for 3 months.

Experimental: Early postnatal IDA

Infants with IDA at 9 months whose cord blood was collected at birth but who were not assessed and assigned to vitamins with or without iron at 6 weeks

Dietary Supplement: Ferrous sulfate (liquid)

Infants who become iron deficient/anemic at 9 or 18 mo will take a single daily dose of 3 mg/kg of elemental iron for 3 months.

Experimental: Late postnatal IDA

Infants with IDA at 18 months whose cord blood was collected at birth but who were not assessed and assigned to vitamins with or without iron at 6 weeks. These infants were also not anemic when screened at 9 months.

Dietary Supplement: Ferrous sulfate (liquid)

Infants who become iron deficient/anemic at 9 or 18 mo will take a single daily dose of 3 mg/kg of elemental iron for 3 months.

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Ages Eligible for Study:

up to 5 Days (Child)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

infants born at Maternity and Children's Hospitals of Fuyang city in China

healthy term newborns from uncomplicated pregnancies for hematology screening

healthy full-term singleton infants with cord Hb and ferritin in the low-marginal or normal range for developmental testing